Thanks gingernut. I may take it further and get an allergy test booked but the former airline pilot I mentioned in the previous post said it did sound like and intolerance rather than an allergy. He also mentioned that airlines try and refrain from serving food with nuts/nut oil in anyway due to the number of people who have the really bad allergic reactions-whereby if they just inhale the smell it can set them off!!!
I can't say I'd run the risk of not declaring it to an AME though-but fair play to you for doing it!!
A.